Carbon fiber guiding device and production system

Abstract

The utility model relates to the field of carbon fiber production, and discloses a carbon fiber guide device and a carbon fiber production system. The device comprises a base, a first rolling mechanism and at least one second rolling mechanism, the first rolling mechanism and the second rolling mechanism are arranged on the base front and back, the first rolling mechanism comprises a first rolling structure, and the first rolling structure comprises a rolling shaft connected with the base and a rolling piece arranged on the rolling shaft in a sleeving mode. The second rolling mechanism comprises a second rolling structure and a swing arm structure corresponding to the second rolling structure, the first rolling structure and the second rolling structure are arranged in parallel, one end of the swing arm structure is connected with the base, and the other end of the swing arm structure is connected with the second rolling structure so that the second rolling structure can be driven to rotate around the connecting point of the swing arm structure and the base. The carbon fiber guide device can adjust the length of a plurality of strands of precursors, so that the paths of the strands of precursors adjusted by the carbon fiber guide device running to an oxidation furnace are the same, and roller winding does not occur on the roller surfaces of metal rollers at an inlet and an outlet of the oxidation furnace.

Description

Technical Field

[0001] The utility model relates to the field of carbon fiber production, in particular to a carbon fiber drawing device and a production system. Background Art

[0002] In the production process of polyacrylonitrile-based large-tow carbon fiber, the raw yarn drawing is very important, which directly affects the production stability of the oxidation process. In order to increase the stable production operation time of the continuous production of large-tow carbon fiber, the raw yarn used in the production of large-tow carbon fiber is not wound in a winding tube, but in a box. However, when the number of wound raw yarns in each box is greater than 1 strand, for example, when 2 strands of raw yarns are unwound in each box, the lengths of the raw yarns are different, that is, there are long and short strands of raw yarns. Before the two strands of raw yarns are unwound to the inlet of the oxidation furnace, the tension values ​​of the two strands of raw yarns are quite different. When entering the oxidation furnace for production, it is easy to cause the phenomenon of tow winding on the metal roller surface at the inlet and outlet of the oxidation furnace.

[0003] The pre-oxidation process of polyacrylonitrile-based precursor is to heat-treat the polyacrylonitrile-based precursor for a long time under heating conditions in an air atmosphere with a certain temperature gradient. The molecular structure of the polyacrylonitrile-based precursor gradually changes from a linear macromolecule to a cross-linked network structure, becoming a fiber with a heat-resistant and stable structure. During the pre-oxidation process, chemical reactions that occur include cyclization, dehydrogenation, aromatization, oxidation, and cross-linking.

[0004] During the pre-oxidation process of polyacrylonitrile-based precursor, the precursor is de-oriented under the action of heating and the polymer macromolecular chain cyclization reaction causes certain physical and chemical shrinkage. When the pre-oxidation temperature is below 200°C, when the oriented macromolecule is above its glass transition temperature, the chain segment activity increases, causing de-orientation and physical shrinkage of the fiber. When the pre-oxidation temperature is above 200°C, the fiber undergoes a cyclization cross-linking reaction under the action of heat and oxygen, causing chemical shrinkage of the fiber. The shrinkage of the polyacrylonitrile-based precursor during the pre-oxidation process produces stress, that is, tension. Pre-oxidation treatment under certain tension conditions is a necessary condition for the preparation and production of large-tow carbon fibers. Applying tension during the pre-oxidation process of polyacrylonitrile-based precursor can prevent the relaxation of the polymer molecular chain and maintain its oriented structure. In the continuous pre-oxidation process, when the number of precursors wound in the boxing method is greater than 1 strand, and 2 strands of precursors are unwound in each box, it is necessary to control the tension of each strand to be stable, and the tension value of each strand of precursor unwound in the precursor box is close to the same, to ensure that each strand of precursor tow is smoothly drawn into the oxidation furnace.

[0005] Chinese patent application CN114457463A discloses a large-tow carbon fiber preoxidation furnace and preoxidation method, which adopts a carbon fiber preoxidation furnace, including a preoxidation furnace box, a furnace, and guide rollers; wherein the guide rollers are arranged in the furnace and are respectively located at both ends of the furnace; the preoxidation furnace box is provided with an exhaust device and an air inlet; the guide roller area is an air sealing area. This technical solution only solves the technical problem of uneven tension in different areas of the same temperature zone in the existing large-tow carbon fiber preoxidation process, but does not solve the technical problem of maintaining constant tension of the tow before the raw silk is unwound to the inlet of the first oxidation furnace.

[0006] Chinese utility model patent CN210418752U discloses a precursor tension device for auxiliary carbon fiber laying, which is used for fiber bundle laying and includes a laying head, a pressure roller is provided at the outlet end of the laying head, a traction roller is provided at the inlet end of the laying head, and a tensioning assembly is provided between the pressure roller and the traction roller. The precursor tension device for auxiliary carbon fiber laying can use tension to reflect the tension of the fiber bundle, but the pressure roller is provided at the outlet end, which is easy to cause damage to the precursor, and the tension value measured by the coordinated use of a spring and a tension sensor is adjusted, which is suitable for the production of small-bundle carbon fiber. When large-bundle carbon fiber is produced, as the number of K (1K=1000 roots) increases, the number of bundles and the bundle width also increase, the bundle tension increases, the spring is subjected to greater force and is easily deformed, affecting the accuracy of measuring the large-bundle bundle tension.

[0007] Chinese patent application CN104775186A discloses a method for preparing low-surface-defect carbon fiber, wherein the precursor of the preparation method adopts dry-jet wet-spinning polyacrylonitrile precursor, and the tension of the tow is controlled by adjusting the drafting amount at a temperature of 180-280°C, and a pre-oxidation reaction is carried out under aerobic conditions, and a pre-carbonization treatment is carried out, and then the carbon fiber product is obtained by surface treatment, sizing, drying, and winding. The preparation method is suitable for the case where the tension of each tow is consistent, and the fiber is effectively prevented from being broken during drafting by optimizing the organizational structure transformation during pre-oxidation and carbonization. However, when the tension between adjacent tows is inconsistent, during the oxidation process, the tow is difficult to control the smooth operation of the tow due to inconsistent tension during drafting, and the tow with low tension is easy to wrap around the roller surface, causing roller winding, and reducing production efficiency.

[0008] Therefore, it is urgent to provide a new carbon fiber drawing device. Utility Model Content

[0009] The purpose of the utility model is to overcome the problem in the prior art that multiple strands of raw yarn are easily entangled on the metal roller surfaces at the inlet and outlet of the oxidation furnace, and to provide a carbon fiber drawing device and a production system. The carbon fiber drawing device can adjust the length of the multiple strands of raw yarn so that the multiple strands of raw yarn adjusted by the carbon fiber drawing device have the same path when running to the oxidation furnace, and no entanglement occurs on the metal roller surfaces at the inlet and outlet of the oxidation furnace.

[0010] In order to achieve the above-mentioned purpose, the first aspect of the utility model provides a carbon fiber threading device, which includes a base and a first rolling mechanism and at least one second rolling mechanism arranged on the base in front and behind. The first rolling mechanism includes a first rolling structure, which includes a rolling shaft connected to the base and a rolling member sleeved on the rolling shaft. The second rolling mechanism includes a second rolling structure and a swing arm structure arranged corresponding to the second rolling structure. The first rolling structure is arranged in parallel with the second rolling structure, one end of the swing arm structure is connected to the base, and the other end is connected to the second rolling structure, so as to be able to drive the second rolling structure to rotate around the connection point between the swing arm structure and the base.

[0011] Preferably, the rolling element is a roller or a wheel.

[0012] Preferably, the swing arm structure includes a first swing arm connected to the base and a second swing arm connected to the second rolling structure, and the first swing arm and the second swing arm are slidably connected.

[0013] Preferably, a slide groove is provided on one of the first swing rod and the second swing rod, and a sliding member suitable for sliding in the slide groove is connected to the other one.

[0014] Preferably, the slide groove is arranged on the second swing rod, the number of the slide grooves is two, and the two slide grooves are arranged along the length direction of the second swing rod.

[0015] Preferably, the swing arm structure is provided with an angle adjustment structure for limiting the rotation angle of the swing arm structure, and the angle adjustment structure is connected to the base.

[0016] Preferably, the angle adjustment structure comprises an arc hole and an angle fixing piece, and the angle fixing piece can pass through the arc hole to be connected to the base, so that the swing arm structure can be relatively fixed to the base after the rotation angle is adjusted.

[0017] Preferably, with the horizontal plane as the reference plane, the rotation angle of the swing arm structure is 0-90°.

[0018] A second aspect of the utility model provides a carbon fiber production system, and the carbon fiber production system comprises the carbon fiber drawing device described in the first aspect.

[0019] Preferably, the carbon fiber production system further comprises a tension adjusting device and an oxidation furnace device, and the carbon fiber drawing device, the tension adjusting device and the oxidation furnace device are arranged in sequence from front to back along the running direction of the precursor.

[0020] Through the above technical scheme, the carbon fiber drawing device provided by the utility model is provided with a first rolling structure and a second rolling structure, so that when the multiple strands of raw yarn wound in the raw yarn loading box enter the carbon fiber drawing device, the short raw yarn only passes through the first rolling structure, and the long raw yarn passes through the first rolling structure and the second rolling structure in turn. The position of the second rolling structure is adjusted by rotating the swing arm structure to increase the running path of the long raw yarn, so that the multiple strands of raw yarn adjusted by the carbon fiber drawing device have the same path when running to the next device.

[0021] The carbon fiber production system provided by the utility model can make the paths of multiple strands of raw yarn adjusted by the carbon fiber drawing device to the oxidation furnace device the same, thereby reducing the deviation rate of the tension value between the multiple strands of raw yarn running to the inlet of the oxidation furnace device, thereby reducing the number of times the yarn bundle is wound around the roller in the oxidation production process, avoiding fire accidents caused by winding around the roller during the operation of the oxidation area and harm to the health of operators, and ensuring the safe production of carbon fiber. In addition, it can also increase the stable production operation time of the carbon fiber production system, reduce the raw carbon ratio of carbon fiber production, and reduce production costs.

[0022] Other advantages of the present invention and the technical effects of the preferred embodiments will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic implementation modes and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 This is a structural schematic diagram of a specific implementation of the carbon fiber drawing device in the utility model;

[0025] Figure 2 This utility model Figure 1 sectional view of

[0026] Figure 3 This utility model Figure 1 A top view of

[0027] Figure 4It is a structural schematic diagram of a specific implementation method of the carbon fiber production system in the utility model.

[0028] Description of Reference Numerals

[0029] 1-carbon fiber threading device, 11-base, 111-base, 112-first mounting hole, 113-fourth mounting hole, 114-fifth mounting hole, 12-first rolling mechanism, 121-first rolling structure, 1211-rolling shaft, 1212-rolling member, 13-second rolling mechanism, 131-second rolling structure, 132-swing arm structure, 1321-first swing rod, 1322-second swing rod, 1323-slide, 1324-second mounting hole, 1325-third mounting hole, 1326-sixth mounting hole, 133-arc hole, 2-tension adjusting device, 3-oxidation furnace device, 31-first oxidation furnace, 32-second oxidation furnace, 33-third oxidation furnace, 4-tension frame, 5-raw silk loading box, 6-steel roller, 7-vertical five-roller device. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connection" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be abutment, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] It should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0033] In the first aspect, in a basic embodiment of the present utility model, see Figure 1-Figure 3The carbon fiber threading device 1 includes a base 11 and a first rolling mechanism 12 and at least one second rolling mechanism 13 arranged on the base 11 in front and back. The first rolling mechanism 12 includes a first rolling structure 121. The first rolling structure 121 includes a rolling shaft 1211 connected to the base 11 and a rolling member 1212 sleeved on the rolling shaft 1211. The second rolling mechanism 13 includes a second rolling structure 131 and a swing arm structure 132 corresponding to the second rolling structure 131. The first rolling structure 121 is arranged in parallel with the second rolling structure 131. One end of the swing arm structure 132 is connected to the base 11 and the other end is connected to the second rolling structure 131, so as to drive the second rolling structure 131 to rotate around the connection point between the swing arm structure 132 and the base 11.

[0034] In the utility model, the carbon fiber drawing device 1 can be applied to the production of carbon fiber and also to the production of textile fiber. The number of the first rolling mechanism 12 is one, the number of the second rolling mechanism 13 can be one or more, and the specific number of the second rolling mechanism 13 can be adjusted according to the number of strands of the raw silk in each raw silk loading box 5. For example, if the number of strands of the raw silk in the raw silk loading box 5 is two, the number of the second rolling mechanism 13 is one, and if the number of strands of the raw silk in the raw silk loading box 5 is three, the number of the second rolling mechanism 13 is two. The first rolling structure 121 and the second rolling structure 131 are arranged in parallel, so that when the raw silk runs from the first rolling structure 121 to the second rolling structure 131, the running path of the yarn bundle in the raw silk is the same, and stable tension can be guaranteed to facilitate the smooth drawing of the raw silk. The first rolling structure 121 includes a rolling shaft 1211 connected to the base 11 and a rolling member 1212 sleeved on the rolling shaft 1211. When the raw yarn enters the carbon fiber drawing device 1 for drawing, the rolling member 1212 can rotate around the rolling shaft 1211 when passing through the rolling member 1212.

[0035] By using the carbon fiber drawing device 1 of the above basic embodiment of the utility model, when the number of strands of the raw yarn in each raw yarn loading box 5 is multiple, the test personnel calculate the path value that needs to be increased for the long raw yarn and the preset value of the rotation angle of the swing arm structure 132 through the length difference of the multiple raw yarns, and then fix the swing arm structure 132 on the base 11 after rotating the swing arm structure 132 so that the rotation angle of the swing arm structure 132 is the preset value; when multiple strands of raw yarn with inconsistent lengths pass through the carbon fiber drawing device 1, the shorter strand of raw yarn directly passes through the first rolling structure 121, and the remaining strands of raw yarn first pass through the first rolling structure 121 and then pass through the corresponding second rolling structure 131 to increase the running path, so that the multiple strands of raw yarn adjusted by the carbon fiber drawing device 1 have the same path when running to the next device.

[0036] In the utility model, the precursor runs from the precursor loading box 5 through the carbon fiber drawing device 1 to the next device. Based on the running direction of the precursor, a first rolling mechanism 12 and at least one second rolling mechanism 13 are arranged on the base 11 in front and back. The front refers to the first rolling mechanism 12 close to the precursor loading box 5, and the back refers to the second rolling mechanism 13 away from the precursor loading box 5, that is, the first rolling mechanism 12 is located in front of the second rolling mechanism 13.

[0037] In the present invention, there is no particular limitation on the specific structure of the base 11, as long as it can achieve the effect of fixing and supporting the first rolling mechanism 12 and the second rolling mechanism 13. The base 11 can be an integrally formed part or can be formed by connecting multiple brackets. There is no particular limitation on the material of the base 11. In order to improve the stability and firmness of the carbon fiber threading device 1, the material of the base 11 can be a high-density material. Preferably, the base 11 is made of metal material or alloy material. For example, the base 11 is made of carbon steel. As a specific embodiment of the base 11, see Figure 1 The base 11 includes two bases 111 of the same structure, and the cross-sectional shape of the base 111 in the vertical direction is an inverted T shape. The first rolling mechanism 12 and the second rolling mechanism 13 are arranged between the two bases 111 to obtain the carbon fiber drawing device 1, which has a simple structure and reduces the production cost of the carbon fiber drawing device 1; moreover, in the process of drawing the precursor in the precursor loading box 5, it is also convenient for the precursor to be directly introduced from the precursor loading box 5 into the first rolling mechanism 12 from bottom to top without being blocked by the base 11.

[0038] In the present invention, the first rolling structure 121 can be connected to the base 11 by welding, or by a first rolling structure connecting member. As a specific implementation of the connection between the first rolling structure 121 and the base 11, see Figure 1 The rolling element 1212 is connected to the base 11 through a first rolling structure connection member, and the first rolling structure connection member includes a first mounting hole 112, a bolt, and a nut provided on the base 11. The rolling element 1212 is installed in the first mounting hole 112 on the base 11, and the rolling element 1212 and the base 11 are fixed by bolts and nuts. This connection method is simple and convenient for the installation, maintenance, and replacement of the first rolling structure 121.

[0039] In the present invention, each second rolling structure 131 may be provided with one swing arm structure 132, or may be provided with two swing arm structures 132. As a specific implementation of the swing arm structure 132, each second rolling structure 131 is provided with two swing arm structures 132, and the two swing arm structures 132 are respectively located at both ends of the second rolling structure 131, and one end of each swing arm structure 132 is connected to the base 11, and the other end is connected to the second rolling structure 131, so as to improve the stability of the carbon fiber drawing device 1 during the drawing process.

[0040] In the present invention, the second rolling structure 131 may include a rolling shaft connected to the swing arm structure 132 and a rolling member sleeved on the rolling shaft. When the precursor enters the carbon fiber drawing device 1 for drawing, it can drive the rolling member to rotate around its corresponding rolling shaft when passing through the rolling member of the second rolling structure 131. In the second rolling structure 131, the rolling shaft may be a conventionally selected rolling shaft in the art, and the effect of the rolling member rotating around the rolling shaft when the precursor passes through the rolling member is sufficient. For example, the rolling member may be a drum or a roller.

[0041] As a specific implementation method of connecting the second rolling structure 131 and the swing arm structure 132, two ends of the second rolling structure 131 are respectively connected with studs, and a second mounting hole 1324 is provided at the end of the swing arm structure 132 away from the base 11. The end of the stud away from the second rolling structure 131 is installed in the second mounting hole 1324, and the swing arm structure 132 and the second rolling structure 131 are connected by the studs. This connection method is simple and convenient for the installation, maintenance and replacement of the second rolling structure 131.

[0042] As a specific implementation of the second rolling structure 131, the second rolling structure 131 is a roller.

[0043] In the present invention, as a preferred embodiment of the rolling element 1212, the rolling element 1212 is a roller or a wheel, and the test personnel can select the rolling element 1212 as a roller or a wheel according to the carbon fiber K number in the precursor in the precursor loading box 5, so as to improve the pulling efficiency of the precursor in the carbon fiber drawing device 1. One rolling shaft 1211 can correspond to one roller, or one rolling shaft 1211 can correspond to multiple rollers.

[0044] Exemplarily, when the raw silk loading box 5 is loaded with two raw silk strands and each raw silk strand is greater than and equal to 48K, the rolling member 1212 can be a roller to improve the drawing efficiency of large raw silk strands; when the raw silk loading box 5 is loaded with three raw silk strands (divided into long, medium and short raw silk strands) and each raw silk strand is less than 48K, the rolling member 1212 can be a roller, the number of rollers is three and the end of each roller is raised to prevent the raw silk from slipping out of the roller, one roller corresponds to one raw silk strand, and the position of multiple raw silk strands can be divided by setting different rollers to avoid the possibility of contact between different raw silk strands, thereby improving the drawing efficiency of the raw silk and reducing energy consumption.

[0045] As a specific implementation of the first rolling structure 121, the first rolling structure 121 is a roller.

[0046] In the present invention, the length of the swing arm structure 132 can be fixed, extended, or shortened. As a preferred embodiment of the swing arm structure 132, see Figure 1-Figure 3 The swing arm structure 132 includes a first swing rod 1321 connected to the base 11 and a second swing rod 1322 connected to the second rolling structure 131. The first swing rod 1321 and the second swing rod 1322 are slidably connected. The test personnel can adjust the position of the second rolling structure 131 based on the adjustment of the rotation angle of the swing arm structure 132 and the adjustment of the length of the swing arm structure 132, so that the operation is more convenient and flexible, and the accuracy of the carbon fiber drawing device 1 in adjusting the length of multiple strands of inconsistent raw fibers is improved.

[0047] As a preferred embodiment of the connection between the first rocker arm 1321 and the second rocker arm 1322, a slide groove 1323 is provided on one of the first rocker arm 1321 and the second rocker arm 1322, and a sliding member suitable for sliding in the slide groove 1323 is connected to the other, so that the first rocker arm 1321 and the second rocker arm 1322 can be extended and retracted in the length direction of the two.

[0048] In the utility model, the sliding member may include a threaded column arranged on the first rocker arm 1321 or the second rocker arm 1322 and a nut matched with the column. After the length of the rocker arm structure 132 is adjusted, the column is passed through the slide groove 1323 and the nut is installed to fix the first rocker arm 1321 and the second rocker arm 1322; the sliding member may also include a sixth mounting hole 1326, a bolt and a nut arranged on the first rocker arm 1321 or the second rocker arm 1322. After the length of the rocker arm structure 132 is adjusted, the bolt is passed through the sixth mounting hole 1326 and the slide groove 1323 and the nut is installed to fix the first rocker arm 1321 and the second rocker arm 1322.

[0049] As a specific embodiment of the connection between the first swing rod 1321 and the second swing rod 1322, see Figure 1-Figure 3The slide groove 1323 is arranged on the second swing rod 1322, and the number of the slide grooves 1323 is two, and the two slide grooves 1323 are arranged along the length direction of the second swing rod 1322 to achieve the movement of the second swing rod 1322 in the length direction thereof, thereby changing the length of the swing arm structure 132. Moreover, the provision of the two slide grooves 1323 further improves the firmness of the connection between the first swing rod 1321 and the second swing rod 1322.

[0050] As a specific implementation of the swing arm structure 132, the length (L3) of the slide groove 1323 is in the range of: 0.10m≤L3≤0.40m, the length of the first swing rod 1321 and the second swing rod 1322 are the same and the length (L4) is in the range of: 0.40m≤L4≤1.00m, at this time, the retractable length (L5) of the swing arm structure 132 is in the range of: L4≤L5≤L4+L3.

[0051] In the present invention, the swing arm structure 132 can be connected to the base 11 by welding, or by a swing arm structure connector. As a specific embodiment of the connection between the swing arm structure 132 and the base 11, see Figure 1 The swing arm structure 132 is connected to the base 11 through a swing arm structure connector. The swing arm structure connector includes a third mounting hole 1325 provided at one end of the swing arm structure 132 close to the base 11, a fourth mounting hole 113 provided on the base 11, bolts and nuts. The third mounting hole 1325 is matched with the fourth mounting hole 113. After aligning the third mounting hole 1325 with the fourth mounting hole 113, the base 11 is connected to the swing arm structure 132 through bolts and nuts. Before the precursor is introduced into the carbon fiber drawing device 1, the bolts and nuts are loosened to make the swing arm structure 132 in a rotatable state, and the swing arm structure 132 is rotated so that the rotation angle of the swing arm structure 132 reaches a preset value. At this time, the position of the second rolling structure 131 is fixed by tightening the bolts and nuts.

[0052] In the present invention, the swing arm structure 132 can drive the second rolling structure 131 to rotate at any angle around the connection point between the swing arm structure 132 and the base 11, and the tester can obtain the range of the rotation angle of the swing arm structure 132 according to the length difference between the multiple strands of different raw silk in the raw silk loading box 5. In order to improve the convenience of the tester's operation, preferably, see Figure 1 The swing arm structure 132 is provided with an angle adjustment structure for limiting the rotation angle of the swing arm structure 132, and the angle adjustment structure is connected to the base 11. The angle adjustment structure can control the swing arm structure 132 to rotate within a limited rotation angle, thereby improving the convenience of operation. Moreover, through the connection between the angle adjustment structure and the base 11, the stability of the connection between the swing arm structure 132 and the base 11 can be improved, thereby improving the safety of the wire drawing process.

[0053] As a preferred embodiment of the angle adjustment structure, the angle adjustment structure includes an arc hole 133 and an angle fixing piece. The angle fixing piece can pass through the arc hole 133 and connect with the base 11, so that the swing arm structure 132 can be relatively fixed to the base 11 after the rotation angle is adjusted, thereby further improving the stability of the connection between the swing arm structure 132 and the base 11.

[0054] In the utility model, the angle fixing component may include a threaded column connected to the base 11 and a nut matching the column. After the rotation angle of the swing arm structure 132 is adjusted, the column is passed through the arc hole 133 and the nut is installed to fix the swing arm structure 132 to the base 11; the angle fixing component may also include a fifth mounting hole 114, a bolt and a nut arranged on the base 11. After the rotation angle of the swing arm structure 132 is adjusted, the bolt is passed through the arc hole 133 and the fifth mounting hole 114 and the nut is installed to fix the swing arm structure 132 to the base 11.

[0055] In the present invention, the rotation angle (α) of the swing arm structure 132 refers to the angle α between the swing arm structure 132 and the horizontal plane with the horizontal plane as the reference plane, see Figure 1 As a preferred embodiment of the rotation angle (α) of the swing arm structure 132, see Figure 2 , with the horizontal plane as the reference plane, the swing angle α of the swing arm structure 132 is 0-90°, specifically 0°, 30°, 60°, 90°, or any value between the above two values, which can further improve the convenience of the test personnel in operation. For example, see Figure 2 When the swing arm structure 132 is located at position A, the rotation angle α of the swing arm structure 132 is 0°; when the swing arm structure 132 is located at position B, the rotation angle α of the swing arm structure 132 is 90°.

[0056] In the present invention, the number of the second rolling mechanism 13 can be one or more, and the specific number can be adjusted according to the number of strands of the raw silk in the raw silk loading box 5. For example, when the number of strands of the raw silk in the raw silk loading box 5 is three (divided into long, medium and short raw silk), as a preferred embodiment of the second rolling mechanism 13, two second rolling mechanisms 13 are provided, and the length and position of the swing arm structure 132 in different second rolling mechanisms 13 can be adjusted according to specific needs.

[0057] The second aspect of the utility model provides a carbon fiber production system, see Figure 4 The carbon fiber production system includes the carbon fiber drawing device 1 described in the first aspect above.

[0058] As a preferred embodiment of the carbon fiber production system, see Figure 1-Figure 4The carbon fiber production system also includes a tension adjustment device 2 and an oxidation furnace device 3. The carbon fiber drawing device 1, the tension adjustment device 2 and the oxidation furnace device 3 are arranged in sequence from front to back along the running direction of the precursor. After the multiple strands of precursors with different lengths in the precursor loading box 5 enter the carbon fiber drawing device 1, the running path of the longer precursor is increased by the carbon fiber drawing device 1, so that the multiple strands of precursors adjusted by the carbon fiber drawing device 1 have the same running path to the tension adjustment device 2, and then the tension is adjusted by the tension adjustment device 2, so that the tension values ​​of different strands of precursors are close to the same, and then run to the oxidation furnace device 3 for oxidation, which can reduce the number of roller windings of the tow in the precursor in the oxidation production process, avoid fire accidents caused by roller winding during the operation of the oxidation area and harm to the health of operators, ensure safe production, and increase the running time of stable production, reduce the raw carbon ratio of carbon fiber production, and reduce production costs.

[0059] In the utility model, the tension adjusting device 2 can be a tension adjusting device conventionally selected in the field, which can change the drawing ratio of the yarn bundle. Specifically, it can be a vertical five-roller device, consisting of 5 metal rollers, 2 metal side plates, and 2 support rods. The two ends of the 5 metal rollers are respectively installed on the metal side plates and fixed with nuts and bolts. One end of the support rod is installed on the metal side plate, and the other end is fixed on the platform. The roller diameter Φ2 of the metal roller is in the range of: 0.05m≤Φ2≤0.15m, and the roller length L2 is in the range of: 0.40m≤L2≤1.00m.

[0060] In the utility model, the oxidation furnace device 3 may include one oxidation furnace or multiple oxidation furnaces, and the number of oxidation furnaces may be adjusted according to the production needs of carbon fiber.

[0061] In the utility model, before the precursor in the precursor loading box 5 enters the carbon fiber drawing device 1, a tension frame 4 can be arranged between the precursor loading box 5 and the carbon fiber drawing device 1 so that the surface of the fiber bundle in the precursor is not folded. As a specific implementation of the tension frame 4, the tension frame 4 adopts a three-roller structure, which is composed of 3 metal rollers, 2 metal side plates, and 2 support rods. The two ends of the 3 metal rollers are respectively installed on the metal side plates and fixed with nuts and bolts. One end of the support rod is installed on the metal side plate, and the other end is fixed on the platform. The roller diameter Φ1 of the metal roller is in the range of: 0.05m≤Φ1≤0.15m, and the roller length L1 is in the range of: 0.64m≤L1≤1.60m.

[0062] The carbon fiber drawing device 1 provided in the first aspect of the utility model performs the drawing process of carbon fiber precursor, including: after adjusting the swing arm structure 132 to a preset angle, multiple strands of carbon fiber precursor with inconsistent lengths are introduced into the carbon fiber drawing device 1, a strand of carbon fiber precursor with a shorter length passes through the first rolling mechanism 12, and the remaining strands of carbon fiber precursor first pass through the first rolling mechanism 12 and then pass through the corresponding second rolling mechanism 13, so that the tension value deviation rate between the multiple strands of carbon fiber precursor is less than 2% before entering the next device.

[0063] In the present invention, the range of the preset angle of the swing arm structure 132 is 0-90°.

[0064] In the present invention, the calculation formula of the tension deviation rate between multiple strands of carbon fiber precursors is:

[0065] Tension value deviation rate (%) = absolute value of the difference between the tension values ​​of the longest and shortest two strands of original yarn / tension value of the shortest original yarn×100%.

[0066] Example 1

[0067] The carbon fiber production system includes a tension frame 4, a carbon fiber drawing device 1, a tension adjustment device 2 and an oxidation furnace device 3. The carbon fiber drawing device 1 includes two bases 111 and a first rolling mechanism 12 and a second rolling mechanism 13 arranged on the two bases 111 in front and behind. The first rolling mechanism 12 includes a first rolling structure 121, and the first rolling structure 121 is a roller. The second rolling mechanism 13 includes a second rolling structure 131 and a swing arm structure 132 arranged corresponding to the second rolling structure 131. The first rolling structure 121 is arranged in parallel with the second rolling structure 131. The two ends of the first rolling structure 121 are respectively installed in the first mounting holes 112 on the two bases 111 and fixed by bolts and nuts. The swing arm structure 132 One end is connected to the base 111, and the other end is connected to the second rolling structure 131, so as to drive the second rolling structure 131 to rotate around the connection point between the swing arm structure 132 and the base 111, and two ends of the second rolling structure 131 are respectively connected with studs, and the end of the stud away from the second rolling structure 131 is installed in the second mounting hole 1324, and the third mounting hole 1325 and the fourth mounting hole 113 are fixed by bolts and studs to connect the swing arm structure 132 and the base 111, and an angle adjustment structure for limiting the rotation angle of the swing arm structure 132 is provided on the swing arm structure 132, and the angle adjustment structure is connected to the base 111, and the angle adjustment structure includes an arc hole 133 and an angle fixing member, and the angle fixing member includes a fifth mounting hole 11 4. Bolts and nuts are used to fix the fifth mounting hole 114 and the arc hole 133, so that the swing arm structure 132 can be relatively fixed with the base 111 after adjusting the rotation angle. Taking the horizontal plane as the reference plane, the rotation angle α of the swing arm structure 132 is 65°. The swing arm structure 132 includes a first swing rod 1321 connected to the base 111 and a second swing rod 1322 connected to the second rolling structure 131. The first swing rod 1321 and the second swing rod 1322 are slidably connected. The second swing rod 1322 is provided with two slide grooves 1323 arranged along the length direction of the second swing rod 1322. The first swing rod 1321 is connected with a sliding member suitable for sliding in the slide groove 1323. The sliding member includes a first swing rod 1321 and a second swing rod 1322. The sixth mounting hole 1326, bolts and nuts on 21 are used to fix the sixth mounting hole 1326 and the slide groove 1323 by bolts and nuts to connect the first swing rod 1321 and the second swing rod 1322; the tension frame 4 adopts a three-roller structure, which is composed of 3 metal rollers, 2 metal side plates, and 2 support rods. The two ends of the 3 metal rollers are respectively mounted on the metal side plates and fixed with nuts and bolts. One end of the support rod is mounted on the metal side plate, and the other end is fixed on the second platform. The tension adjustment device 2 is a vertical five-roller device, which is composed of 5 metal rollers, 2 metal side plates, and 2 support rods. The two ends of the 5 metal rollers are respectively mounted on the metal side plates and fixed with nuts and bolts. One end of the support rod is mounted on the metal side plate, and the other end is fixed on the second platform.A steel roller 6 is arranged between the carbon fiber drawing device 1 and the tension adjusting device 2; the oxidation furnace device 3 includes a first oxidation furnace 31, a second oxidation furnace 32 and a third oxidation furnace 33; a steel roller 6 and a vertical five-roller device 7 are arranged between the tension adjusting device 2 and the first oxidation furnace 31. ;

[0068] The carbon fiber production system is used to industrially produce 60 boxes of 120 strands of 48K carbon fiber precursor. The drawing method includes the following steps:

[0069] (1) 60 boxes of raw silk loading boxes 5 (each box contains 2 strands of 48K raw silk) are placed on the operating platform on the first floor. Two strands of 48K raw silk in each box are first drawn through the tension frame 4. The tension frame 4 controls the two strands of raw silk to swing back and forth in the raw silk loading box 5 to unwind, keep the raw silk surface from folding, and smoothly introduce the raw silk into the carbon fiber drawing device 1;

[0070] (2) Two strands of raw yarn enter the carbon fiber drawing device 1, the short raw yarn runs through the first rolling structure 121, and the long raw yarn passes through the first rolling structure 121 and the second rolling structure 131 in sequence. The position of the second swing rod 1322 and the angle of the first swing rod 1321 are adjusted by a preset length, so that the path lengths of the two strands of raw yarn after adjustment by the carbon fiber drawing device 1 and running to the tension adjustment device 2 are nearly consistent;

[0071] (3) After the tension of the two strands of raw silk is adjusted by the tension adjusting device 2, they are passed through the steel roller 6 and the vertical five-roller device 7 and run to the inlet of the oxidation furnace device 3;

[0072] (4) The two strands of raw silk are carbonized in the first oxidation furnace 31, the second oxidation furnace 32, and the third oxidation furnace 33 in sequence, and then go through the production process of surface treatment, washing, sizing, drying, and winding to produce 120 strands of 48K carbon fiber.

[0073] Example 2-Example 6

[0074] Compared with Example 1, the parameters of the carbon fiber precursor, tension frame 4, and tension adjustment device 2 in the carbon fiber production system provided in Examples 2 to 6 are different, and the specific parameters are shown in Table 1; the parameters of the carbon fiber drawing device 1 are different, and the specific parameters are shown in Table 2.

[0075] The carbon fiber was produced according to the drawing method of Example 1. The tension of the multiple strands of raw yarn before entering the oxidation furnace device 3 and the carbon fiber production conditions are shown in Table 3.

[0076] Comparative Example

[0077] Compared with Example 1, the difference is that the carbon fiber production system does not have the carbon fiber drawing device 1, the tension frame 4 and the tension adjustment device 2.

[0078] The carbon fiber production system is used to industrially produce 60 boxes of 120 strands of 48K carbon fiber precursor. The drawing method includes the following steps:

[0079] 60 boxes of raw silk loaded into the spinning box 5 (each box contains 2 strands of 48K raw silk) are placed on the operating platform on the first floor. 2 strands of 48K raw silk in each box are drawn into the steel roller 6, and then successively carbonized by the vertical five-roller device 7, the first oxidation furnace 31, the second oxidation furnace 32, and the third oxidation furnace 33, and then go through the surface treatment, water washing, sizing, drying, and winding production processes to obtain 120 strands of 48K carbon fiber.

[0080] Table 1

[0081]

[0082] Table 2

[0083]

[0084] Table 3

[0085]

[0086] It can be seen from the results in Table 3 that, compared with the comparative example, Examples 1 to 6 use the carbon fiber production system provided by the utility model to draw multiple strands of raw yarn, which can reduce the deviation rate of the tension value of the two strands of the raw yarn in each box of raw yarn loading box 5, thereby reducing the number of times the yarn is wound around the roller in the oxidation production process, avoiding fire accidents caused by winding during the operation of the oxidation area, endangering the health of the operators, and ensuring safe production. In addition, it can also increase the running time of stable production, reduce the raw carbon ratio of carbon fiber production, and reduce production costs.

[0087] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0088] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. In addition, the various different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A carbon fiber drawing device, characterized in that: The device comprises a base (11), a first rolling mechanism (12) and at least one second rolling mechanism (13) which are arranged on the base (11) front and rear, wherein the first rolling mechanism (12) comprises a first rolling structure (121), the first rolling structure (121) comprises a rolling shaft (1211) connected to the base (11) and a rolling member (1212) sleeved on the rolling shaft (1211), the second rolling mechanism (13) comprises a second rolling structure (131) and a swing arm structure (132) arranged corresponding to the second rolling structure (131), the first rolling structure (121) and the second rolling structure (131) are arranged in parallel, one end of the swing arm structure (132) is connected to the base (11), and the other end is connected to the second rolling structure (131), so as to drive the second rolling structure (131) to rotate around a connection point between the swing arm structure (132) and the base (11).

2. The carbon fiber drawing device according to claim 1, characterized in that: The rolling element (1212) is a roller or a wheel.

3. The carbon fiber drawing device according to claim 1, characterized in that: The swing arm structure (132) comprises a first swing rod (1321) connected to the base (11) and a second swing rod (1322) connected to the second rolling structure (131), and the first swing rod (1321) and the second swing rod (1322) are slidably connected.

4. The carbon fiber drawing device according to claim 3, characterized in that: A slide groove (1323) is provided on one of the first swing rod (1321) and the second swing rod (1322), and a sliding member suitable for sliding in the slide groove (1323) is connected to the other.

5. The carbon fiber drawing device according to claim 4, characterized in that: The slide groove (1323) is arranged on the second swing rod (1322), and the number of the slide grooves (1323) is two, and the two slide grooves (1323) are arranged along the length direction of the second swing rod (1322).

6. The carbon fiber drawing device according to any one of claims 1 to 5, characterized in that: The swing arm structure (132) is provided with an angle adjustment structure for limiting the rotation angle of the swing arm structure (132), and the angle adjustment structure is connected to the base (11).

7. The carbon fiber drawing device according to claim 6, characterized in that: The angle adjustment structure comprises an arc hole (133) and an angle fixing member, and the angle fixing member can pass through the arc hole (133) to be connected to the base (11), so that the swing arm structure (132) can be relatively fixed to the base (11) after the rotation angle is adjusted.

8. The carbon fiber drawing device according to claim 6, characterized in that: With the horizontal plane as the reference plane, the rotation angle of the swing arm structure (132) is 0-90°.

9. A carbon fiber production system, characterized in that: The carbon fiber production system comprises the carbon fiber drawing device (1) according to any one of claims 1 to 8.

10. The carbon fiber production system according to claim 9, characterized in that: The carbon fiber production system also includes a tension adjustment device (2) and an oxidation furnace device (3), wherein the carbon fiber drawing device (1), the tension adjustment device (2) and the oxidation furnace device (3) are arranged in sequence from front to back along the running direction of the raw fiber.

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